A Method of Underwater Target Location Based on Second-Order Interference

Abstract

The invention discloses an underwater target positioning method based on second-order interference. The second-order interference theory of optical measurement is applied to underwater acoustic field detection to perform underwater target positioning; The order correlation function searches for the phase (time) delay of the sound source signal relative to the array element, and obtains the difference of the absolute linear distance between the sound source and the two array elements. For a multi-element array, the position of the sound source can be quickly and accurately searched by calculating the product of multiple second-order correlation functions. The positioning method of the present invention is not limited to "the distance between the array elements of the sensor array needs to meet the requirement of 1/2 wavelength", which greatly reduces the requirements for array design and processing; and the output signal-to-noise ratio of a single sensor array element in the present invention is far less than 1 It still shows good positioning ability, which is beneficial to the detection and positioning of long-distance targets. Therefore, the present invention has important application value for the underwater target positioning detection of the underwater acoustic sensor array.

Description

technical field [0001] The invention belongs to the technical field of underwater detection and relates to an underwater target positioning technology, in particular to an underwater target positioning method based on the second-order (Hanbry Brown-Twiss) interference principle of an underwater acoustic field. Background technique [0002] As we all know, the attenuation of light waves and electromagnetic waves in water is very large, and their propagation distance is relatively short, which is far from meeting the needs of people in ocean activities. Sound waves, however, can travel very far. Therefore, people mainly use sound waves to detect underwater targets. With the strengthening of human development and utilization of the ocean, especially the emergence of various new submarines in the military, countries all over the world have conducted extensive research on sonar detection technology for underwater targets (submarines, UUVs, torpedoes, etc.). The development of s...

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Problems solved by technology

[0004] Based on the underwater detection system composed of sound pressure hydrophones and their basic arrays, the existing positioning methods have problems of "the output signal-to-noise ratio of the array elements is too low during long-distance detection" and "the topology of the array must meet the requirements of 1 / 2 wavelength". requirements" etc.

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